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Intangible Assets - Schedules (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets    
Gross Amount $ 288 $ 284
Accumulated Amortization (91) (71)
Net Amount 197 213
Franchise rights    
Finite-Lived Intangible Assets    
Gross Amount 255 255
Accumulated Amortization (68) (51)
Net Amount 187 204
Customer lists and Trade name    
Finite-Lived Intangible Assets    
Gross Amount 27 29
Accumulated Amortization (23) (20)
Net Amount 4 9
Other    
Finite-Lived Intangible Assets    
Gross Amount 6 0
Accumulated Amortization 0 0
Net Amount 6 0
Licenses    
Licenses    
Balance, beginning of period 2,638 2,480
Acquisitions 1,464 171
Transferred to Assets held for sale (18)  
Divestitures   (18)
Capitalized interest 13 5
Balance, end of period 4,097 2,638
Licenses | UScellular    
Licenses    
Balance, beginning of period 2,633 2,475
Acquisitions 1,464 171
Transferred to Assets held for sale (18)  
Divestitures   (18)
Capitalized interest 13 5
Balance, end of period 4,092 2,633
Licenses | TDS Telecom    
Licenses    
Balance, beginning of period 5 5
Acquisitions 0 0
Transferred to Assets held for sale 0  
Divestitures   0
Capitalized interest 0 0
Balance, end of period $ 5 $ 5